777 research outputs found
Are You Being Rejected or Excluded? Insights from Neuroimaging Studies Using Different Rejection Paradigms
No full textRejection sensitivity is the heightened tendency to perceive or anxiously expect disengagement from others during social interaction. There has been a recent wave of neuroimaging studies of rejection. The aim of the current review was to determine key brain regions involved in social rejection by selectively reviewing neuroimaging studies that employed one of three paradigms of social rejection, namely social exclusion during a ball-tossing game, evaluating feedback about preference from peers and viewing scenes depicting rejection during social interaction. A cross the different paradigms of social rejection, there was concordance in regions for experiencing rejection, namely dorsal anterior cingulate cortex (ACC), subgenual ACC and ventral ACC. Functional dissociation between the regions for experiencing rejection and those for emotion regulation, namely medial prefrontal cortex, ventrolateral prefrontal cortex (VLPFC) and ventral striatum, was evident in the positive association between social distress and regions for experiencing rejection and the inverse association between social distress and the emotion regulation regions. The paradigms of social exclusion and scenes depicting rejection in social interaction were more adept at evoking rejection-specific neural responses. These responses were varyingly influenced by the amount of social distress during the task, social support received, self-esteem and social competence. Presenting rejection cues as scenes of people in social interaction showed high rejection sensitive or schizotypal individuals to under-activate the dorsal ACC and VLPFC, suggesting that such individuals who perceive rejection cues in others down-regulate their response to the perceived rejection by distancing themselves from the scene
Advances in the deposition chemistry of metal-containing thin films using gas phase processes
No full textBahlawane N, Kohse-Höinghaus K, Premkumar PA, Lenoble D. Advances in the deposition chemistry of metal-containing thin films using gas phase processes. CHEMICAL SCIENCE. 2012;3(4):929-941
Gas phase synthesis of metal oxide monolithic catalysts for hydrocarbon deep oxidation
No full textBahlawane N, Premkumar A, Fehling K, Kohse-Höinghaus K. Gas phase synthesis of metal oxide monolithic catalysts for hydrocarbon deep oxidation. In: Gaigneaux EM, ed. Scientific bases for the preparation of heterogeneous catalysts. Studies in Surface science and catalysis. Vol 162. Elsevier; 2006: 625-632
FIGURE 1. A. A in Symplocos sisparensis (Symplocaceae), a new species from the Nilgiri Biosphere Reserve, India
No full textFIGURE 1. A. A Twig; B & C. Leaf abaxial & adaxial view; D. Inflorescence; E. Flower bud with bracteole; F. Calyx lobes; G. Petal; H & I. Flower adaxial & abaxial view; J. Glands on disk; K. Androecium; L. Style – hairy; M. Gynoecium; N. Fruit.Published as part of Karthik, B., Murugesan, M., Anusuba, V., Premkumar, M. & Tharani, R., 2023, Symplocos sisparensis (Symplocaceae), a new species from the Nilgiri Biosphere Reserve, India, pp. 83-90 in Phytotaxa 589 (1) on page 85, DOI: 10.11646/phytotaxa.589.1.8, http://zenodo.org/record/775507
Catalytically enhanced H2-free CVD of transition metals using commercially available precursors
No full textBahlawane N, Premkumar PA, Onwuka K, Rott K, Reiss G, Kohse-Höinghaus K. Catalytically enhanced H2-free CVD of transition metals using commercially available precursors. SURFACE & COATINGS TECHNOLOGY. 2007;201(22-23):8914-8918.The deposition of metals using thermal CVD in a hydrogen-free atmosphere was investigated starting from nontoxic metalorganic precursors. A remarkably simple process, which relies on the chemical reduction by alcohols, allows the deposition of high-quality films of a variety of metals and alloys. The growth characteristics of metal films are investigated as a function of temperature, and their performance is discussed in terms of electrical resistivity. Near-bulk resistivities were obtained for Ni, Co, Cu, and Ag, while Fe presents a 37-fold higher resistivity than the bulk because of the poor packing of crystallites. In this work, the deposition conditions for the growth of single-phase cubic or hexagonal nickel were determined. (c) 2007 Elsevier B.V. All rights reserved
Improved Memoryless RNS Forward Converter Based on the Periodicity of Residues
No full textThe residue number system (RNS) is suitable for DSP architectures because of its ability to perform fast carry-free arithmetic. However, this advantage is over-shadowed by the complexity involved in the conversion of numbers between binary and RNS representations. Although the reverse conversion (RNS to binary) is more complex, the forward transformation is not simple either. Most forward converters make use of look-up tables (memory). Recently, a memoryless forward converter architecture for arbitrary moduli sets was proposed by Premkumar in 2002. In this paper, we present an extension to that architecture which results in 44% less hardware for parallel conversion and achieves 43% improvement in speed for serial conversions. It makes use of the periodicity properties of residues obtained using modular exponentiation
Alcohol-assisted CVD of silver using commercially available precursors
No full textBahlawane N, Premkumar PA, Brechling A, Reiss G, Kohse-Höinghaus K. Alcohol-assisted CVD of silver using commercially available precursors. CHEMICAL VAPOR DEPOSITION. 2007;13(8):401-407.A novel chemical approach was demonstrated for the growth of high-quality, silver films by CVD. This concept relies on the catalytic reactivity of cationic silver, and of silver surfaces with alcohols. This leads to high-purity films using either state-of-the-art precursors or silver salts that have not been yet considered as CVD precursors. The occurrence of the catalytic oxidative-dehvdrogenation of alcohols, considered as the driving force in this process, was shown by in-situ mass spectrometry (MS). Films of fcc-Ag with p <= 2 mu Omega cm were grown without any noticeable contamination. Ag(hfac)COD leads to the growth of a (111) highly orientated film on glass at a rate of 1.66 nm min(-1), while polycrystalline films are grown at a rate of 18.5 run min(-1) using AgNO3
Multiple stimuli-responsive double perovskite structured Ca2MgWO6: x % Eu3+ (x = 1–11 mol) red-emitting luminescent systems to combat counterfeiting
No full textThe rapid escalation of counterfeiting activities in recent years has posed significant challenges across diverse fields, such as pharmaceuticals, currency, luxury goods, and electronics. In response, inorganic phosphors have emerged as promising tools to combat counterfeiting due to their inherent durability and stability. The present work focuses on the synthesis of Ca2MgWO6: x % Eu3+ (x = 1-11 mol) luminescent systems via a gel-combustion route. The structural analysis of the synthesized luminescent systems confirmed a monoclinic crystal phase with a P21/n space group. The morphological study of the luminescent system revealed a network-like structure comprising interconnected particles. Photoluminescence emission spectra show a prominent red emission peak at 616 nm, corresponding to the 5D0 -> 7F2 4f-4f electronic transition of Eu3+ ions in the host matrix. The emitted red light demonstrates a color purity and quantum efficiency of 93.1 % and 77.41 %, respectively. The anticounterfeiting security patterns were developed using the Ca2MgWO6: x % Eu3+ (x = 9 mol) luminescent system, which showcases virtually invisible under normal light. However, developed patterns exhibit vivid red luminescence when exposed to multiple stimuli i.e., ultraviolet light at 365 and 395 nm wavelength, which envisages the versatility of the systems for enhancing product authentication and protecting against fraudulent activities across multiple industries. The aforementioned results demonstrated the efficacy of Ca2MgWO6: Eu3+ luminescent systems for integration into advanced security measures
A study on magnetic resonance imaging in endomyocardial fibrosis(1)A comparative study of balloon mitral valvotomy and closed mitral valvotomy in juvenile mitral stenosis (2)
No full textMixing and regime transition analysis of liquid-solid conical fluidized bed through RPT technique
No full textThe current work focuses on the hydrodynamic study of liquid-solid mono and binary conical fluidized bed using the radioactive particle tracking technique. Two different sizes 0.6 and 1 mm diameter glass beads were used for the experiment. Two different bed compositions, mono dispersed (100 wt% of each solid) and 50 wt% mixture of the solids, were studied. A rich data base, including instantaneous velocities, mean and RMS velocities, granular temperature, etc., were calculated by suitable post-processing. Further, Hurst exponent, autocorrelation function, segregation index, Kolmogorov entropy, and correlation dimension were calculated using time series data to understand the mixing and chaotic nature of the fluidized bed for each set of data. Good degree of mixing was observed even at a low velocity of 0.07 m/s. Kolmogorov entropy and correlation dimension indicate regime change at liquid inlet velocity of 0.1 m/s for both mono and 50 wt% binary bed.Fil: Kalo, Lipika. Indian Institute of Technology Guwahati; IndiaFil: Kamalanathan, Premkumar. Bhabha Atomic Research Centre; IndiaFil: Pant, Harish J.. Bhabha Atomic Research Centre; IndiaFil: Cassanello Fernandez, Miryam Celeste. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Industrias. Instituto de Tecnología de Alimentos y Procesos Químicos. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Tecnología de Alimentos y Procesos Químicos; ArgentinaFil: Upadhyay, Rajesh K.. Indian Institute of Technology Guwahati; Indi
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